lecidea] lecideace-e 95 



then sordid-violet with iodine. — L. intumescens Nyl. in Act. Soc. 

 Linn. Bord. ser. 3, i. p. 373 (1856) ; Mudd Man. p. 205, t. 3, 

 f. 76 ; Cromb. Lich. Brit. p. 85 ; Leight. Lich. Fl. p. 254 ; ed. 3, 

 p. 246. L. hadia var. /3 intumescens Flot. Lich. Siles. n. 175 

 (1830). 



Exsicc. Leight. n. 161 ; Mudd n. 174. 



Distinguished by the manner and place of growth. With us it 

 always forms small, orbicular, insulated patches on the thallus of 

 Lecanora glaucoma, usually limited by the hypothallus. As noted by 

 Mudd, though not strictly a parasite, it at length destroys the thallus 

 of the plant upon which it germinates. In the specimens seen the 

 apothecia are numerous and crowded. 



Hah. On rocks in maritmie and upland hilly districts. — Distr. 

 Only here and there sparingly in Great Britain ; not seen from Ireland 

 ■or the Channel Islands. — B. M. Malvern Hills, Worcestershire ; 

 Gimlet Rock, Pwllheli, and Snowdon, Carnarvonshire ; Caer Caradoc, 

 Shropshire ; Lounsdale and Cliffrigg, Cleveland, Yorkshire ; near Port- 

 lethen, Kincardineshire. 



173. L. confusula Nyl. in Flora Iv. p. 360 (1872).— Thallus 

 indeterminate, thinnish, granulate or granulate-conglomerate, the 

 glomerules thia, scattered, olive-grey or greyish- brown (K — , 

 CaCl — ). Apothecia small, adnate, convex, immarginate, black, 

 whitish within ; hypothecium colourless ; paraphyses concrete ; 

 epithecium yellowish-brown (K — ) ; spores ellipsoid, 0,007- 

 0,011 mm. long, 0,004-5 mm. thick ; hymenial gelatine deep- 

 blue then wine-red with iodine. — Cromb. in Grevillea 1. p. 61 ; 

 Leight. Lich. Fl. ed. 3, p. 266. 



Hab. On micaceous rocks or on walls. — B. M. Craig Tulloch, 

 Blair Athole, Perthshire (the only locality). 



174. L. nig-rificans Nyl. in Flora lix. p. 307 (1876).— Thallus 

 effuse, thin, rugulose, areolate-rimose, opaque, blackish, internally 

 green (K — ). Apothecia small, subprominent, plane, slightly 

 margined, black, the margin at times bluish-grey, suffused ; 

 liypothecium colourless ; paraphyses distinct, moderate ; epithe- 

 cium blackish-blue-green; spores ellipsoid, 0,011-12 mm. long, 

 0,006-7 mm. thick ; hymenial gelatine wine-red with iodine. — 

 Cromb. in Grevillea v. p. 27 ; Leight. Lich. Fl. ed. 3, p. 292. 



Distinguished from the preceding by the colours of the thallus and 

 the occasionally suffused margins of the apothecia, which in the 

 specimen seen are subminute and numerous. 



Hab. On a schistose rock in a maritime district. — B. M. Killery 

 33ay, Connemara, Gal way (the only locality). 



175. L. leiotea Nyl. in Flora 1. p. 328 (1867).— Thallus 

 determinate, thin, continuous, smooth, obsoletely rimulose, shiny- 

 brown or greyish-black. Apothecia submoderate, adnate, plane, 

 margined, black, the margin obtuse or indistinct ; hypothecium 

 colourless ; paraphyses moderate, thicker and brownish at the 



